package com.dubbo.snail.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @Description TODO
 * @Author xueguoping
 * @Date 2021/5/10 14:29
 */
@Component
public class MyCustomLoadBalancer implements LoadBalancer{
	private AtomicInteger atomicInteger = new AtomicInteger(0);

	private final int getAndIncrement(){
		int current;
		int next;
		do{
			current = atomicInteger.get();
			next = current >= 2147483647 ? 0:current+1;
		}while (!this.atomicInteger.compareAndSet(current,next));

		System.out.println("*****第几次访问，次数next: "+next);
		return next;
	}

	public ServiceInstance instance(List<ServiceInstance> serviceInstances) {
		int index = getAndIncrement() % serviceInstances.size();
		return serviceInstances.get(index);
	}
}
